bagage

Why in dive industry nobody makes a nice backpacks for diving gear like they do it for hiking and camping? I do love Apkes DRY75L Twin Core http://www.apeksdiving.com/us/products/dry-bags/product/dry75l-twin-core-for-combined-wet-dry-storage.html Or 100L version...

I'm flying Los Angeles to Male on Emirates through Dubai in a few weeks and I normally check two cases of gear, and carry a large roll aboard and a shoulder bag onboard with me. How strict are they regarding size and weight of the carry ons? Also, in coach do they really restrict you to one...